Wideband current wireless measuring device based on tunneling magnetoresistance effect

被引：0
|
作者：
Bi L. [1 ]
Zeng X. [1 ]
Yu K. [1 ]
Liu F. [1 ]
Wu X. [1 ]
机构：
[1] School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2024年 / 44卷 / 04期
基金：
中国国家自然科学基金;
关键词：
noninvasive measurement; sensors; transients; tunneling magnetoresistance; wideband;
D O I：
10.16081/j.epae.202306010
中图分类号：
学科分类号：
摘要：
Wideband electrical quantity data contains a large amount of fault transient information. Due to the limited bandwidth of the traditional transformers，it is difficult to measure the wideband transient signal accurately and comprehensively. Aiming at this problem，a noninvasive current measurement method with precise time scale is proposed and a principle prototype is designed. The magnetic field induced by the line current is measured by the tunneling magnetoresistance（TMR）chip. The transformation ratio is calculated according to the relative installation position between the measured conductor and the TMR sensor and the wave is recorded and read by the microcontroller unit（MCU）. The sensor module circuit with wideband，low noise and variable gain，and the transient recording wireless measurement transmission module circuit are designed to accurately perceive wideband signals. Then，according to the actual installation position of the sensor，the transfer relationship formula is deduced to realize the accurate calculation of the primary current. The testing platform is built to test the DC，AC and transient signal transmission capability of the measuring device，and the grounding fault current measurement comparison experiment is carried out by 10 kV distribution network. The main factors affecting the measurement accuracy of the TMR sensor are analyzed. The results show that the measurement error of DC and 50 Hz signals of TMR sensor is less than 1% and the measurement error of high frequency signal of TMR sensor is less than 3%. © 2024 Electric Power Automation Equipment Press. All rights reserved.
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页码：204 / 210
页数：6
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